This is where the M797 gets finicky.
These are low-side drivers (ECU switches to ground). bosch m797 pinout better
Ignition Switch Power (+12V Switch / Term 15) — Tells the ECU to wake up. This is where the M797 gets finicky
This guide is a foundational document for any electronic work on this ECU. Always verify with a multimeter before making permanent wiring changes, as manufacturers sometimes make minor changes to the factory wiring harnesses. pins group into:
Based on several OEM schematics, pins group into: